Ocean Optics Jaz Install - Manual (Page 52)

5: Operating the JAZ-INDY Module
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c. Set the output voltage (in counts) until the voltmeter reads 4.5V. Then select Calibrate |
Voltage In | ●Maximum, set the voltage to 4.5V and select ●Sample at 4.5V.
6. Repeat this procedure for each of the input channels.
Note
There are two special channels (Vin 1 – Vin 2 and Vin 3 – Vin 4) that are differential (the
hardware finds the difference between the corresponding input pins). To calibrate these,
You must use two voltage inputs at once and set them to opposite values (e.g., set one to
+4.5V, the other to -4.5V, to calibrate the differential input at +9V). The process is the
same as described above, except that the differential inputs should be calibrated at -9V,
0.0V, and 9V.
For the 0.0V measurement, set both of the voltage outputs being driven in to zero. For the
non-zero measurements, both voltage input/output pairs should be confirmed on the
external voltmeter prior to finishing the calibration.
Calibrating the 4-20mA Transmitter
The JAZ-INDY module provides a 4-20mA current controller that must be calibrated. There are only two
setpoints for this controller: 4mA and 20mA. The controller can be calibrated by passing the current
directly through a digital multimeter (ensure first that the meter is rated to withstand at least 30mA to
prevent damage). JAZ-INDY provides an excitation source that can be used to power the current
transmitter (pin 19). If you use this internal source, set it to 20V (this can be done in SpectraSuite) and
ground the output of the current loop (after passing through the multimeter) back to the JAZ-INDY
module (using any of the ground pins).
Calibrating the 4-20mA Receiver
Once the 4-20mA transmitter has been calibrated, it can be used to calibrate the receiver.
► Procedure
1. Move the ground connection from the current loop used in calibrating the 4-20mA transmitter so
that it is instead connected to pin 11 (4-20 Sense).
2. Vary the current output of the 4-20mA transmitter until 4mA is reached.
3. In the Jaz menu, select Calibrate | 4-20 mA Rx | Minimum. Set the mA value, if needed, to 4.0
and then select Sample 4.0mA.
4. Select Calibrate | 4-20 mA Rx | Maximum, then repeat this process for the 20mA setpoint.
Operating JAZ-INDY from SpectraSuite
The JAZ-INDY module offers the same menu selections on the Spectrometer Features screen: